Masaharu Suzuki

New Shape Grease Pocket for Traction Motors to Facilitate Base Oil Supply

The cycle of induction motor disassembly inspections depends on the durability of the grease, which is the least durable of all the bearing parts and materials used at present. It is therefore highly desirable to extend grease service life. To meet such requirements, a number of studies were made into grease pocket structures, which concluded that an improvement in structure was essential as grease pocket shapes have a direct relationship on grease lubrication effectiveness. A laboratory test under static conditions was performed with small grease pocket models of different shapes to formulate a grease pocket design guideline.

Analysis of Wear Particles in Lubricant for Non-Disassembling Inspection of EMU Gear Units

A method to predict gear failures without dismantling the gear units uses analysis of the wear particles in the gear oil by ferrography. It shows a relationship between typical gear failures and the features of such particles. Only a small sample of lubricant is needed to reach an accurate conclusion.